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Related Concept Videos

Radical Autoxidation01:20

Radical Autoxidation

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The oxidation of an organic compound in the presence of air or oxygen is called autoxidation. For example, cumene reacts with oxygen to form hydroperoxide. Autoxidation involves initiation, propagation, and termination steps. Many organic compounds are susceptible to autoxidation—especially ethers in the presence of oxygen, which form hydroperoxides. Even though this reaction is slow, old ether bottles contain small amounts of peroxide, which leads to laboratory explosions during ether...
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Aging01:26

Aging

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Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
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Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

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The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
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Oxidation of Phenols to Quinones01:17

Oxidation of Phenols to Quinones

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In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
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Bioactivation and Tissue Toxicity01:25

Bioactivation and Tissue Toxicity

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Bioactivation is a metabolic process that transforms less reactive substances into highly reactive metabolites, initiating tissue toxicity. This transformation can lead to various toxic effects, including carcinogenesis and teratogenesis. Reactive metabolites are classified into two main types: electrophiles and free radicals.Electrophiles are electron-deficient species and are produced primarily by the enzyme cytochrome P-450 during the metabolism of compounds containing carbon, nitrogen, or...
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Oxygen Requirements and Growth Patterns01:29

Oxygen Requirements and Growth Patterns

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Microorganisms exhibit diverse oxygen requirements and growth patterns driven by their metabolic strategies and environmental adaptations. Oxygen, while essential for many organisms, can also be toxic under certain conditions, shaping how microorganisms grow and survive.Oxygen Requirements of MicroorganismsMicroorganisms are classified based on their ability to use or tolerate oxygen:● Obligate aerobes like Mycobacterium tuberculosis need oxygen for energy production, as it serves as the...
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Production and Detection of Reactive Oxygen Species ROS in Cancers
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Production and Detection of Reactive Oxygen Species ROS in Cancers

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Antioxidants and human diseases.

Peramaiyan Rajendran1, Natarajan Nandakumar2, Thamaraiselvan Rengarajan1

  • 1NPO-International Laboratory of Biochemistry, 1-166, Uchide, Nakagawa-ku, Nagoya 454-0926, Japan.

Clinica Chimica Acta; International Journal of Clinical Chemistry
|June 17, 2014
PubMed
Summary

Reactive oxygen species (ROS) are crucial in cell function and disease. Antioxidants protect against ROS accumulation, offering a safeguard in various human illnesses.

Keywords:
AntioxidantCancerDiabetesOxidative stress

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Area of Science:

  • Biochemistry and Molecular Biology
  • Cell Biology
  • Pathophysiology

Background:

  • Oxidative stress, mediated by reactive oxygen species (ROS), is integral to cellular processes, including growth, differentiation, and death.
  • ROS, such as hydrogen peroxide and hydroxyl radicals, can damage cellular components like lipids, nucleic acids, and proteins.
  • While low ROS levels are vital for signaling and defense, elevated levels contribute to diseases like cancer, diabetes, and arthritis.

Purpose of the Study:

  • To review current understanding of reactive oxygen species (ROS) and their biological roles.
  • To summarize the impact and involvement of antioxidants in the context of human diseases.

Main Methods:

  • Literature review of scientific articles on oxidative stress, ROS, and antioxidants.
  • Synthesis of information on the mechanisms of ROS generation and damage.
  • Analysis of the role of antioxidants in mitigating ROS-associated pathologies.

Main Results:

  • ROS are implicated in normal cellular functions and pathological conditions.
  • High ROS levels are linked to numerous human diseases, including cancer, diabetes, and inflammatory conditions.
  • Antioxidants are proposed to counteract ROS, potentially preventing or treating these diseases.

Conclusions:

  • Understanding ROS and antioxidant functions is critical for human health.
  • Antioxidants represent a potential therapeutic strategy for diseases associated with oxidative stress.
  • Further research into ROS-antioxidant interactions can illuminate disease mechanisms and treatment options.